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Employee Benefit Plans - Additional Information (Details) - shares shares in Thousands | 1 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2018 | Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items] |  |
Defined contribution retirement plan, plan name |  | 401(k) plan
2018 ESPP |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Shares of common stock reserved for issuance | 200 | 244
Common stock purchase price, discount rate | 15.00% |
Maximum | 2018 ESPP |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Period of automatic annual increase in the share reserve | 10 years |
401(k) Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined contribution retirement plan, maximum employee contribution deferred |  | 100.00%

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition Discount rate from fair value on purchase date that participants pay for shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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